By having random drug tests with no advanced notice.
Be on alert for; Their having diluted urine or having put bleach in their urine. Measure urine temperature to see it is body temp. this prevents someone bringing in another persons specimen.
It is somewhat a hoax that someone can "beat" a drug test, new "drug cleansers" come around every few months, likely because the last stuff was proven ineffective.
Stop using it for a sufficient period of time to allow the body to clear it. In general, there is no 100% effective way to "fool" a drug test, as the people that make the tests are constantly refining them to catch people who are trying to beat the tests. The best method to pass drug tests is to stop using the drugs in question.
The best way to beat a cold is to use Oil of Oregano. It is available at most drug stores/supermarkets.
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No
companies that do not drug test their workers
They do not drug test regular employees
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no
yes
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yes